Furnace



' July 3, 1923.

Y L. E. SMITH ET AL FURNACE Filed Aug. 14, 1922 4 Sheets-Sheet 2 59.5

lI/I

July 3, 1923.

L. E. SMITH ET AL FURNACE Filed Aug. 14, 1922 4 Sheets-Sheet 5 H IIIIIIIIIIIIII July 3,

L. E. SMITH ET AL FURNACE Filed Aug. 14, 1922 4 Sheets-Sheet 4 Patented July 3, i923.

LnUncnLom nuszrncn sivrrrn, or souun SHIELDS, CORNELIS ZULVER, or LONDON, nun nnnnnnr ALEXANDER THOMPSON, or nonrn snrntns, ENGLAND.

FURNACE.

Application filed August 14, 1922. Serial No. 581,818.

To all whom it may concern:

Be it known that we, Launonnor Eos'racn SMITH, of South Shields, in the county of Durham, England, a subject of the king of Great Britain, Connnms ZULVER, of St.

Helens Court, Great St. Helens, in the city type adapted for conversion to the use of either solid or liquid fuels, and has for its object to provide an improved construction thereof, particularly adapted for use with natural draught.

A furnace made in accordance with the present invention consists of a front plate carrying a front extension or air casing ex tending over more or less of the front and adapted to have interchangeably fitted thereto, or thereon, either a casting forming the usual fire opening fitted with the usual door, or an oil burning assembly or unit consisting of an oil burner with a surrounding baffling or deflecting cone at or about its inner end, an intermediate air deflecting or baffle plate being provided in the air casing and suitable air regulating dampers or valves.

The air deflecting plate or baffle may be so built up and mounted that portions thereof may remain when the furnace is converted for coal firing.

The oil burning fitments may be arranged for removal and replacement as one unit or assembly if required.

The accompanying drawings show two constructions of the improved furnace.

lis a front elevation partly in section,

Fig. 2 is a sectional plan, and

Fig. 3 is'a vertical section; of Fig. 1.

Figs. 4: and 5am respectively a vertical section and sectional plan, showing the construction of Figs. 1 to 3 converted for coal firing.

Fig. 6-is a sectional front elevation.

Fig. 7 is a sectional plan, and

Fig. 8 a vertical section showing a modified construction.

Fig. 9 is a vertical section illustrating how the construction shown in Figs. 6 to 8 is converted for coal firing.

In the construction shown in Figs. 1 to 3, the furnace is fitted with a front plate a, carrying an air casing b,the outer end of which is fitted with a cover plate 0 carrying a suitable air damper d, the said air damper which is operated by handles 6 is preferably made toslide on studs 6, which also serve to support a bracket f, carrying the burner holder 9 and burner g, which is provided with a flame tube g having a flared or conical end 9 h is a baffling cone disposed at or about the inner end of the oil burner g and leading into the furnace from the air casing b.

An air deflecting plate i is mounted around the oil burner g in the air casing b and the central portion a" of this deflecting plate 5 is preferably made separate from the wing portions 2' so as to be removed with the oil burner and its fitments whilstthe wing portions 2' may be allowedto remain, if desired, as shown in Fig. 1 during coal burning and in this way the process of changing over from coal to oil burning and vice versa, is facilitated.

j is the usual shield plate protecting the plate a. If desired helical vanes may be fitted around the oil burner in the cone it.

In use for oil burning, when the air damper cl is open the air entering thereby is prevented from rushing straight through the air casing 6 into the furnace by the deflecting plate 2', which also serves as an air heater by absorbing the radiant heat from the furnace which is carriedofl? by the cold air rushing in over the surface of the said plate. After passing around the deflecting plate 2' the air enters the furnace around the burner g through the concentrating and baffling cone 72,, and a highly eflicient combustion results.

When converting from oil to coal burning the parts g, g, g 9 it, 0, Z, c, f, and the central part i of the air deflecting plate 71 are removed, and if desired, these parts may be so connected and arranged as to be drawn out of place as one unit or assembly and in the place of same, and as shown in Figures 4 and 5 the casting is is fitted to form the usual fire opening for coal burning, and this castpermanently attached to the boiler so as to.

remain in position for either coal or oil burning. This air casing Z) extends entirely over the furnace front and is made with an access door Z for the purpose of removing ashes when coal burning, which door Z also serves as an air admission damper when oil burn- Lil The cover plate 0 carries the burner holder 9, burner g and flame tube 9 with cone g and h is the baffling cone around the oil burner, all very similar to the corresponding parts shown in Figures 1 to 3, but in this construction the air deflecting plate 6 extends across the air casing Z2 below the burner and its fitments between the same and the access and damper door Z, and is carried upwards, preferably in a curve, as shown in Figure 6, alongside the oil burner, so that the air entering by the door Z passes up each side of the air casing and around the end of the air deflecting plate 2' before entering the baffling cone it around the oil burner.

This construction provides ample means for air heating asthe front is kept cool by the air passing over practically the whole of its surface, which naturally causes the air to be effectively heated before its delivery to the furnace through the cone it.

When oil burning a suitable closing plate m is fitted to the ash pit opening to prevent the air admitted through the damper Z passing into the furnace as happens when coal burning.

Helical vanes of suitable form and angle such as indicated at a, Figure 8, may be fitted in the cone it around the oil burner.

lVhen it is desired to revert to coal burning the parts 9 g g h, 0 and m are removed and in place of the same the casting 76, Fig. 9, is fitted to form the usual fire opening for coal burning, the usual fire door It being provided.

WVhat we claim as out invention and desire to secure by Letters Patent is l. A natural draft furnace front adapted for conversion to the use of either solid or liquid fuel comprising the combination of a front plate closing the furnace front except for an opening to the ash pit and having a firing opening of the ordinary four sided form cut into said plate, an inwardly converging baffling cone fitting directly into said firing opening in said plate, an external air heating casing fitted against the plate and about said firing opening in the plate,

said air heating casing enclosing a chamber which covers the furnace front and said firing opening and baffling cone and which is open to the cone all around its circumference whereby there is a free air inlet space to he cone all around, and an oil burner extending through the said air chamber and having an inwardly flaring cone located within said baffling cone.

2. A natural draft furnace front adapted for conversion to the use of either solid or liquid fuels comprising the combination of a front plate closing the furnace front except for the firing opening and an opening to the ash pit, an external casing extending at least over that portion of the front normally occupied by the fire door, an oil burner unit consisting of an oil burner with surrounding baffling cone about its inner end, an air deflecting plate mounted in the external casing around the oil burner and consisting of a central portion attached to said oil burner and separate wing portions fixed in said casing, so that the said central part may be removed with the oil burner unit whilst the wing portions remain during coal firing, air regulating dampers or valves for admitting air to said casing, means whereby the said oil burner unit or an ordinary coal burning fire opening casing and firing door may be fitted in position upon said external casing and wherel y the furnace may be converted for either coal or oil firing.

3. A natural draft furnace front" adapted for conversion to the use of either solid or liquid fuels comprising the combination of a front plate closing the furnace front except for the firing opening and an opening to the ash pit, an external casing extending at least over that portion of the front normally occupied by the fire door, an oil burner unit consisting of an oil burner with surrounding baffling cone about its inner end, an air deflecting plate mounted in the external casing around the oil burner and consisting of a central portion attached to said oil burner and separate wing portions fixed in said casing, so that the said central part may be removed with the oil burner unit whilst the wing portions remain during coal firing, air regulating dampers or valves for admitting air to said casing, means whereby the said oil burner unit or an ordinary coal burning fire opening casing and fire door may be fitted in position upon said external casing and whereby the furnace may be converted for either coal or oil firing, helical vanes fitted around the oil burner.

LAUNCELGT EUSTACE SMITH. CGENELIS ZULVER. HERBERT ALEXANDER THOMPSON. 

